I am shortly due to take delivery of a new Audi S3 Sportback. It has been recommended to me that I install some sort of tracking device. It seems that thieves like small, fast, four-door cars and firstly I'd like to minimise chances of theft while secondly perhaps have some benefit in my insurance premiums. I live in central London and drive the car only at weekends and probably 5 times a month. It is left for long periods of time parked on the street. Audi installs and recommend a system called CobraTrak 5. There is a rival system from Tracker and various others provided by different companies. Different systems have a mixture of GPS / GSM and VHF transmiters / DVLA notification etc. Can you give me any advice?